|author||ajo thomas <firstname.lastname@example.org>||Tue Mar 30 17:12:13 2021 -0700|
|committer||GitHub <email@example.com>||Tue Mar 30 17:12:13 2021 -0700|
Changed StreamOperatorTask to throw appropriate Exception when InputOperator is not found for a SystemStream in the OperatorGraph (#1483) Symptom: Samza job fails with a TaskCallbackTimeoutException if InputOperator is not found in OperatorGraph for a SystemStream Cause: Currently, the pipeline silently fails when there is no InputOperator for a SystemStream in the OperatorGraph as the code doesn't handle such cases. The pipeline just silently fails and the job would throw an exception due to sync task callback timeout (TaskCallbackTimeoutException). One of the scenarios that causes this is due to non-determinism in the plan seen by the containers and the AM. It can happen in multiple scenarios where the transform/operators have non-determinism in generating their names. e.g. we noticed beam transform appended hashcode. Changes: Call failure method of the TaskCallback with a SamzaException with the appropriate exception message.
Apache Samza is a distributed stream processing framework. It uses Apache Kafka for messaging, and Apache Hadoop YARN to provide fault tolerance, processor isolation, security, and resource management.
Samza's key features include:
To build Samza from a git checkout, run:
./gradlew clean build
To build Samza from a source release, it is first necessary to download the gradle wrapper script above. This bootstrapping process requires Gradle to be installed on the source machine. Gradle is available through most package managers or directly from its website. To bootstrap the wrapper, run:
gradle -b bootstrap.gradle
After the bootstrap script has completed, the regular gradlew instructions below are available.
./gradlew -PscalaSuffix=2.11 clean build
To run all tests:
./gradlew clean test
To run a single test:
./gradlew clean :samza-test:test -Dtest.single=TestStatefulTask
To run key-value performance tests:
./gradlew samza-shell:kvPerformanceTest -PconfigPath=file://$PWD/samza-test/src/main/config/perf/kv-perf.properties
To run yarn integration tests:
./bin/integration-tests.sh <dir> yarn-integration-tests
To run standalone integration tests:
./bin/integration-tests.sh <dir> standalone-integration-tests
./gradlew checkstyleMain checkstyleTest
To run a job (defined in a properties file):
./gradlew samza-shell:runJob -PconfigPath=/path/to/job/config.properties
To inspect a job's latest checkpoint:
./gradlew samza-shell:checkpointTool -PconfigPath=/path/to/job/config.properties
To modify a job's checkpoint (assumes that the job is not currently running), give it a file with the new offset for each partition, in the format
./gradlew samza-shell:checkpointTool -PconfigPath=/path/to/job/config.properties \ -PnewOffsets=file:///path/to/new/offsets.properties
To get Eclipse projects, run:
For IntelliJ, run:
Apache Samza is a top level project of the Apache Software Foundation.